Abstract: A Methods and application for mobile devices that allow users to engage in an audio and/or video call using QR code. The system comprises a call service system and a mobile app to be executed on the user's mobile device for initiating a call and receiving a call. Contact information of one or more call recipient are recorded in a ping tag. The QR code is generated from a network call-placing process identifying the said ping tag as the call destination. Using a default camera app on a mobile device, the present invention allows a caller to simply scans QR code to place a call to call recipient(s) associated with the ping tag of the present invention through the call service system.

Abstract: A method and apparatus for transparently linking keywords displayed in a document viewer on a display monitor attached to the said computer system to information on a remote web-based information retrieval system (or web site) comprises of an access agent executing on a computer system. The said web site is coupled to the said computer system over a computer network and executes a keyword lookup server as a server-side program (CGI) for providing a keyword-based information retrieval service which is remotely accessible using standard Universal Resource Locator (URL) web access method (or HTTP). The said access agent installs one or more input device handlers for intercepting and scanning user input for one or more pre-configured hot key. Each of the said hot keys is mapped to one or more URLs which contain a special marker to be replaced by a keyword selected by the user and is used to access the said lookup service for retrieving information associated with the said user-selected keyword.